There is a confirmed bug with viewing Google Maps embedded using Internet Explorer 7.
One user reported the issue in the Google Maps Help forums, sharing a screen shot of the issue. In short, when you use the standard Google Maps embed code and try to view the map on the page when using IE7, it will show a dialog menu that the map is loading.
Here is a screen shot:
Daniel from Google confirmed the bug saying:
We are currently working to resolve this issue. I'll be sure to pass this information along to the team. I'll also be sure to update you on any progress we make. Thanks again for coming to the forum to report this problem.
Forum discussion at Google Maps Help.